projectized-common.compile:
[depend] The class org.netbeans.modules.scala.core.lexer.ScalaLexer in file /Users/mushtaq/projects/kojo/ScalaEditorLite/build/classes/org/netbeans/modules/scala/core/lexer/ScalaLexer.class is out of date due to org.netbeans.modules.scala.core.rats.LexerScala but has not been deleted because its source file could not be determined
[nb-javac] Compiling 1 source file to /Users/mushtaq/projects/kojo/ScalaEditorLite/build/classes

BUILD FAILED
/Applications/NetBeans/NetBeans 7.2.app/Contents/Resources/NetBeans/harness/suite.xml:184: The following error occurred while executing this line:
/Users/mushtaq/projects/kojo/KojoEnv/scala-build.xml:91: The following error occurred while executing this line:
/Users/mushtaq/projects/kojo/KojoEnv/scala-build.xml:53: The following error occurred while executing this line:
/Users/mushtaq/projects/kojo/KojoEnv/scala-build.xml:69: Compilation failed because of an internal compiler error; see the error output for details.

I have no idea how to increase the heap size inside scalac call. But no worries, I am liking the kojolite much better for playing with the code. I have cloned it and made a few changes to the build. More in the issue#1 in kojolite google site.